/**
 * Software License, Version 1.0
 * 
 * Copyright 2003 The Trustees of Indiana University.  All rights reserved.
 * 
 *
 *Redistribution and use in source and binary forms, with or without 
 *modification, are permitted provided that the following conditions are met:
 *
 *1) All redistributions of source code must retain the above copyright notice,
 * the list of authors in the original source code, this list of conditions and
 * the disclaimer listed in this license;
 *2) All redistributions in binary form must reproduce the above copyright 
 * notice, this list of conditions and the disclaimer listed in this license in
 * the documentation and/or other materials provided with the distribution;
 *3) Any documentation included with all redistributions must include the 
 * following acknowledgement:
 *
 *"This product includes software developed by the Community Grids Lab. For 
 * further information contact the Community Grids Lab at 
 * http://communitygrids.iu.edu/."
 *
 * Alternatively, this acknowledgement may appear in the software itself, and 
 * wherever such third-party acknowledgments normally appear.
 * 
 *4) The name Indiana University or Community Grids Lab or NaradaBrokering, 
 * shall not be used to endorse or promote products derived from this software 
 * without prior written permission from Indiana University.  For written 
 * permission, please contact the Advanced Research and Technology Institute 
 * ("ARTI") at 351 West 10th Street, Indianapolis, Indiana 46202.
 *5) Products derived from this software may not be called NaradaBrokering, 
 * nor may Indiana University or Community Grids Lab or NaradaBrokering appear
 * in their name, without prior written permission of ARTI.
 * 
 *
 * Indiana University provides no reassurances that the source code provided 
 * does not infringe the patent or any other intellectual property rights of 
 * any other entity.  Indiana University disclaims any liability to any 
 * recipient for claims brought by any other entity based on infringement of 
 * intellectual property rights or otherwise.  
 *
 *LICENSEE UNDERSTANDS THAT SOFTWARE IS PROVIDED "AS IS" FOR WHICH NO 
 *WARRANTIES AS TO CAPABILITIES OR ACCURACY ARE MADE. INDIANA UNIVERSITY GIVES
 *NO WARRANTIES AND MAKES NO REPRESENTATION THAT SOFTWARE IS FREE OF 
 *INFRINGEMENT OF THIRD PARTY PATENT, COPYRIGHT, OR OTHER PROPRIETARY RIGHTS. 
 *INDIANA UNIVERSITY MAKES NO WARRANTIES THAT SOFTWARE IS FREE FROM "BUGS", 
 *"VIRUSES", "TROJAN HORSES", "TRAP DOORS", "WORMS", OR OTHER HARMFUL CODE.  
 *LICENSEE ASSUMES THE ENTIRE RISK AS TO THE PERFORMANCE OF SOFTWARE AND/OR 
 *ASSOCIATED MATERIALS, AND TO THE PERFORMANCE AND VALIDITY OF INFORMATION 
 *GENERATED USING SOFTWARE.
 */
package cgl.narada.transport.util;


public class BytesUtil {

    /**
     * @param l long 
     * @return byte array for the given long integer  
     */
    public static byte[] longToBytes(long l) {
        byte[] bytes = new byte[8];

        bytes[0] = (byte)((l >> 56) & 0xff);
        bytes[1] = (byte)((l >> 48) & 0xff);
        bytes[2] = (byte)((l >> 40) & 0xff);
        bytes[3] = (byte)((l >> 32) & 0xff);
        bytes[4] = (byte)((l >> 24) & 0xff);
        bytes[5] = (byte)((l >> 16) & 0xff);
        bytes[6] = (byte)((l >> 8)  & 0xff);
        bytes[7] = (byte) (l & 0xff);
        return bytes;
    }

    /**
     * @param bytes array of size 8
     * @return long integer converted
     */
    public static long   bytesToLong(byte[] bytes) {
        return  (((long)(bytes[0] & 0xff) << 56) |
                 ((long)(bytes[1] & 0xff) << 48) |
                 ((long)(bytes[2] & 0xff) << 40) |
                 ((long)(bytes[3] & 0xff) << 32) |
                 ((long)(bytes[4] & 0xff) << 24) |
                 ((long)(bytes[5] & 0xff) << 16) |
                 ((long)(bytes[6] & 0xff) <<  8) |
                 ((long)(bytes[7] & 0xff)));
    }

    /**
     * @param i int
     * @return byte array for that given int
     */
    public static byte[] intToBytes(int i) {
        byte[] buf = new byte[4];

        buf[0] = (byte)((i & 0xff000000) >> 24);
        buf[1] = (byte)((i & 0x00ff0000) >> 16);
        buf[2] = (byte)((i & 0x0000ff00) >> 8);
        buf[3] = (byte)(i & 0x000000ff);
        return buf;
    }

    /**
     * @param buf byte array of size 4
     * @return int converted from given byte array
     */
    public static int  bytesToInt(byte[] buf) {
        return (((int)buf[0]) << 24) & 0xff000000 |
               (((int)buf[1]) << 16) & 0x00ff0000 |
               (((int)buf[2]) << 8) & 0x0000ff00  |
                 (int)buf[3] & 0x000000ff;
    }

}
